Cooling System; Important Warnings - Polini THOR 260 Use And Maintenance Manual

a long time too much. Take care of your engine by varying now and
then the rpm range. In this way the engine will have constant perfor-
mance and a good elasticity improving its working during the time.
10.1- TEMPERATURE THERESHOLDS
Your engine is equipped with a thermocouple to read the water
temperature to which it is possible to connect a specific instrument
(928.830.003) that detects the water temperature, the rpm and the
operation hours (not supplied) (Standard operating temperatures: min.
55°, max. 90°)
If you use the engine in cold weather conditions and the water tempe-
rature does not reach the minimum one of 55° we suggest you should
install a thermostat with 60° opening (code 928.830.009).
Eventually the EGT temperature can be checked using the optional ther-
mocouple item. 928.830.014, to insert in its housing on the exhaust
(photo 12).
The EGT temperature detected in standard conditions of use should be
around 550°-650°, maximum temperature 680°.
11- ENGINE FITTING ON THE FRAME
Fix the engine into the frame using the two h. 60 aluminium spacers
supplied which must be positioned in the bottom. Fit the spark plug on
the head and the water connection with the two screws and OR provided.
Place the propeller mounting flange and secure it with the supplied nut
using a 19 bush and lock it with a torque wrench to 80 N.m.
Connect the fuel pipe to the tank. To prevent any residue of dirt
entering the carburetor it is recommended to put a fuel filter (item
928.468.002). Furthermore connect a breather pipe from the reservoir
system to the tank. Rotate the filter box and fix it firmly to the frame
using the proper fixing tools.

COOLING SYSTEM

We recommend you should install the radiator in the higher side than
the cylinder (see exploded view A). Fix the bracket supplied between
the two upper vibration-dumping mountings and the frame (see pic.15).
Fit the two rubbers on the bracket and place the radiator. To fix the
radiator in the top side a bracket and a rubber are provided. Cut to
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size the water pipes and mount them. Close the supplied clamps using
special pliers for its fitting (photo 16).
It is possible to place the radiator even in the bottom (see exploded view
B). To facilitate the passage of the water tube on the head you have to
use a special 90° connector - cod. 928.225.004 and 928.225.006 (not
supplied). In this case you should be very careful to the position of the
radiator that must have a proper housing and a strong fixing. Eventually
place a breather pipe (928.225.006 and 928.225.004) to avoid air
bubbles may start (see exploded view B)
Fill the cooling system using coolant specifically designed for aluminum
radiators. For the circuit with low radiator let the air go out of the
breathers. Check the level and proceed with the bleeding operation after
having run the engine for the first time . Then start the engine for a
few seconds; stop the engine, check the level and if necessary top up
with some liquid.

IMPORTANT WARNINGS

If for technical or constructional requirements the radiator has to be
mounted in a different applications than those suggested, it is recom-
mended the utmost attention to the passage of the water pipes that must
not have tight folds and they should not facilitate the formation of drain
pipes. If so add some air breathers.
TRACTOR CONFIGURATION
Thor 260 engine may be used in tractor configuration. In this con-
figuration the standard vibration-damping rubbers cannot stand the
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ENGLISH